基于参数估计与十字定位的放射源快速搜寻方法研究

辐射防护 ›› 2022, Vol. 42 ›› Issue (6): 563-570.

基于参数估计与十字定位的放射源快速搜寻方法研究

徐航, 艾宪芸, 管弦, 齐圣, 谢建明, 王英

国民核生化灾害防护国家重点实验室,北京 102205

收稿日期:2022-03-09 出版日期:2022-11-20 发布日期:2023-01-05
通讯作者: 王英。E-mail:wy2576@sina.com
作者简介:徐航(1995—),男,2016年毕业于中国科学技术大学核技术专业,2019年毕业于军事科学院辐射防护及环境保护专业,获硕士学位,现为军事科学院核技术及应用专业在读博士研究生。E-mail:1019372717@qq.com
基金资助:
国家自然科学基金资助项目(12075318);国民核生化灾害防护国家重点实验室基金(SKLNBC2020-06)。

Research on fast searching method of radioactive sources based on parameter estimation and cross locating

XU Hang, AI Xianyun, GUAN Xian, QI Sheng, XIE Jianming, WANG Ying

State Key Laboratory of NBC Protection for Civilian,Beijing 102205

Received:2022-03-09 Online:2022-11-20 Published:2023-01-05

摘要/Abstract

摘要： 遗失放射源的快速精准搜寻是进行航空放射源定位的核心问题。分析参数估计及十字定位两种放射源定位方法的优缺点,基于蒙特卡罗方法模拟计算得到¹³⁷Cs点源及天然本底空间辐射场数据,分别获得了参数估计法最优采样范围(最大定位精度所需采样点的最小分布范围)和十字定位法最优阈值(定位成功率大于95%时的最低剂量率)。针对参数估计法耗时长、十字定位法精度差的问题,提出了基于上述两种定位方法的组合式定位方法,该方法首先基于最优阈值利用十字定位法快速逼近至放射源附近,后基于最优采样范围使用参数估计法精准定位放射源位置。外场实验数据的测试结果表明,该方法相比于十字定位法精度提高49.6%;耗时相对于参数估计法减少71.1%。

关键词: 放射源定位, 参数寻优, 组合式定位, 蒙特卡罗模拟

Abstract: The rapid and accurate search of lost radioactive sources is the core technology for radioactive source locating by aerial measurement. In this paper, the advantage and disadvantages of two methods, parameter estimation and cross locating method, were analyzed. Monte Carlo simulation was used to obtain the dose rate distribution of ¹³⁷Cs point radioactive source and natural background in the model of air-ground interface. Based on the simulation data, The optimal sampling range of the parameter estimation method (the minimum distribution range of sampling points required for maximum positioning accuracy) and the optimal threshold of the cross locating method (the minimum dose rate when the positioning success rate is greater than 95%) were obtained respectively. Aiming at the problem that the parameter estimation method is time-consuming and the accuracy of cross location method is poor, based on the obtained optimal parameters, a combined location method is proposed. The method firstly uses the cross locating method to quickly approach the radiation source, and then uses the parameter estimation method for precise positioning, and tested with simulation and field experimental data. The results show that the accuracy of this combined location method is improved by 49.6% compared with the cross locating method; and the time consumption is reduced by 71.1% compared with the parameter estimation method.

Key words: location of radioactive source, parameter optimization, combined locating method, monte carlo simulation

中图分类号:

TL81

徐航, 艾宪芸, 管弦, 齐圣, 谢建明, 王英. 基于参数估计与十字定位的放射源快速搜寻方法研究[J]. 辐射防护, 2022, 42(6): 563-570.

XU Hang, AI Xianyun, GUAN Xian, QI Sheng, XIE Jianming, WANG Ying. Research on fast searching method of radioactive sources based on parameter estimation and cross locating[J]. RADIATION PROTECTION, 2022, 42(6): 563-570.

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